User blog comment:Sefiros2211/Dante's Age/@comment-7738747-20130525194133

DMC1: Dante is 28/29 years old, based on Kamiya's information about Dante has the same age of Space Pirate Cobra.

DMC3 Dante is 19. Hideki Itsuno confirmed this in a old interview.

DMC2 Unknown, but early 40's.

DMC4 Dante is at least 36 years old.I remember an old interview on PSM telling he was near forties.

DmC Dante is in early 20's. Barbas confirmed this in game and in Raptor news site.He is older than DMC3 Dante, but they're not even the same person, since they belong to alternative universes.